<template>
  <div>
    <el-upload action="https://edu-10yh.oss-cn-hangzhou.aliyuncs.com" :data="dataObj" list-type="picture"
               :multiple="false" :show-file-list="showFileList" :file-list="fileList" :before-upload="beforeUpload"
               :on-remove="handleRemove" :on-success="handleUploadSuccess" :on-preview="handlePreview">
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过10MB</div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="fileList[0].url" alt="">
    </el-dialog>
  </div>
</template>
<script>
import { policy } from '@/api/common/policy'
import { getUUID } from '@/utils'

export default {
  name: 'singleUpload',
  props: {
    value: String
  },
  computed: {
    imageUrl () {
      return this.value
    },
    imageName () {
      if (this.value != null && this.value !== '') {
        return this.value.substr(this.value.lastIndexOf('/') + 1)
      } else {
        return null
      }
    },
    fileList () {
      return [{
        name: this.imageName,
        url: this.imageUrl
      }]
    },
    showFileList: {
      get: function () {
        return this.value !== null && this.value !== '' && this.value !== undefined
      },
      set: function (newValue) {
      }
    }
  },
  data () {
    return {
      dataObj: {
        policy: '',
        signature: '',
        key: '',
        ossaccessKeyId: '',
        dir: '',
        host: ''
        // callback:'',
      },
      dialogVisible: false
    }
  },
  methods: {
    emitInput (val) {
      this.$emit('input', val)
    },
    handleRemove (file, fileList) {
      this.emitInput('')
    },
    handlePreview (file) {
      this.dialogVisible = true
    },
    async beforeUpload (file) {
      const { data } = await policy()
      this._self.dataObj = { ...data }
      this._self.dataObj.key = this._self.dataObj.dir + getUUID() + '-' + file.name
    },
    handleUploadSuccess (res, file) {
      console.log('上传成功！ file:', file)
      this.showFileList = true
      this.fileList.pop()
      this.fileList.push({name: file.name, url: this.dataObj.host + '/' + this.dataObj.key})
      this.emitInput(this.fileList[0].url)
    }
  }
}
</script>
<style>
</style>
